Consider the above reaction sequence. Identify the component A and component B :

The sugar produced after complete hydrolysis of DNA is

The reagent neutral ferric chloride is used to detect the presence of ______________

Blister copper is produced by reaction of copper oxide with copper sulphide.

2Cu₂O + Cu₂S $$\to$$ 6Cu + SO₂

When 2.86 $$\times$$ 10³ g of Cu₂O and 4.77 $$\times$$ 10³ g of Cu₂S are used for reaction, the mass of copper produced is _____________ g. (nearest integer)

(Atomic mass of Cu = 63.5 a.m. u, S = 32.0 a.m. u, O = 16.0 a.m. u)